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Ancient Sea Spider Fossils Discovered In Volcanic Ash

Date:
October 22, 2004
Source:
Yale University
Summary:
Volcanic ash that encased and preserved sea life in the Silurian age 425 million years ago near Herefordshire, UK has yielded fossils of an ancient sea spider, or pycnogonid, one of the most unusual types of arthropod in the seas today.

A computer reconstruction of Haliestes (artificially colored, above), and a modern sea spider, Nymphon (bleached, below), which is about 50% larger, and with longer legs.
Credit: Image Yale University

New Haven, Conn. – Volcanic ash that encased and preserved sea life in the Silurian age 425 million years ago near Herefordshire, UK has yielded fossils of an ancient sea spider, or pycnogonid, one of the most unusual types of arthropod in the seas today.

Sea spiders are soft-bodied arthropods, found widely in modern oceans. For two-centuries there has been a controversy about the relationship of sea spiders to land spiders, scorpions, ticks and mites because of their unique body form. Sea spiders have a long proboscis and unusual limb structures used in mating and carrying brooding embryos. The fossil record of their relationship is sparse because of their delicate nature.

"This is the earliest adult fossil example, and it is preserved in extraordinary detail," said author Derek Briggs, professor of geology and geophysics, and Director of the Yale Institute of Biospheric Studies. "Volcanic ash that trapped ancient sea life in this location rapidly encased the creatures making a concrete-like cast of the bodies. The cavity later filled in with carbonate solids so we have a fossil record to study now."

To create a picture of the fossils, the specimens were ground away a few microns at a time, each slice digitally imaged, and then the whole reconstructed using computer graphics. The reconstruction suggests that these exotic animals are indeed related to land spiders, scorpions, mites and ticks.

The new species, Haliestes dasos,, represents the earliest known adult sea spider by 35 million years. Its large pincers place the sea spiders firmly within a larger grouping that includes scorpions, mites, ticks, the real spiders and the horseshoe crab. Despite its ancient, Silurian age the new species appears to have lived in a similar way to modern ones, on the seabed, or perhaps on sponges

The research was carried out as part of a project on the Herefordshire fauna by a team made up of Derek Siveter and Mark Sutton at Oxford, Derek Briggs at Yale, and David Siveter at Leicester. The group has made a number of other spectacular finds of soft-bodied organisms in the same deposit including crustaceans, a worm-like mollusc, a polychaete worm, and a starfish, and much that remains to be described.

###

Citation: Nature 432: 978-980 (October 21, 2004)

Further information is available at: http://www.earth.ox.ac.uk/herefordshire/haliestes/haliestes.htm


Story Source:

The above story is based on materials provided by Yale University. Note: Materials may be edited for content and length.


Cite This Page:

Yale University. "Ancient Sea Spider Fossils Discovered In Volcanic Ash." ScienceDaily. ScienceDaily, 22 October 2004. <www.sciencedaily.com/releases/2004/10/041022105150.htm>.
Yale University. (2004, October 22). Ancient Sea Spider Fossils Discovered In Volcanic Ash. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2004/10/041022105150.htm
Yale University. "Ancient Sea Spider Fossils Discovered In Volcanic Ash." ScienceDaily. www.sciencedaily.com/releases/2004/10/041022105150.htm (accessed July 31, 2014).

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